Clarify comments in CI setup and the Rust workflow (#43070)

GitOrigin-RevId: 4e116749fb02894e3fcabe757f9bdc915b48c1d0

.github/actions/setup-ci/action.yml

@@ -12,7 +12,7 @@ runs:
   using: composite
   steps:
     # setup-ci expects either this step or the Unix fallback below to define
-    # CI_BUILD_ROOT. Windows puts it on a Dev Drive because Cargo and Bazel
+    # CI_BUILD_ROOT. Windows uses a Dev Drive because Cargo and Bazel
     # spend significant time reading and writing build/cache trees.
     - name: Configure Dev Drive (Windows)
       if: runner.os == 'Windows'

.github/workflows/rust-ci.yml

@@ -4,7 +4,7 @@ on:
   workflow_dispatch:
 
 jobs:
-  # --- Detect what changed so the fast PR workflow only runs relevant jobs ----
+  # --- Detect changed paths so the fast PR workflow only runs relevant jobs ---
   changed:
     name: Detect changed areas
     runs-on: ubuntu-24.04